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I live in Phoenix. This time of year the average temperature is 110 degrees. I have Clover and Spurge popping up all over my Bermuda lawn (really it is Tifway, a Bermuda hybrid). All the weed killers I have found on the market (at the locak hardware store) specifically state not to use over 85 degrees. I made this mistake years ago and killed my yard. What weed killer can I use in these above 100 degree temperatures to kill broad leaf weeds?